Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Mitsutoshi Yoshida and Koji Ishigaki and Vernon G. Pursel,Effect of maturation media on male pronucleus formation in pig oocytes matured in vitro,Molecular Reproduction and Development,1040-452X,Wiley,1992-01,31,1,68-71,https://cir.nii.ac.jp/crid/1363951794898561664,https://doi.org/10.1002/mrd.1080310112